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how many GRE tunnels can a 3600 and 2600 router support?

Trying to determine the best cisco router to use for a network that will be running about 20 gre tunnels on each router. I do not wish to over size the router and by all means not to under size my router selection.

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Re: how many GRE tunnels can a 3600 and 2600 router support?

Either of these routers (26/3600) would work for you for 20 tunnels.

How many are actually supported is mainly a limit of IDB's (interface descriptor blocks) that are used to identify interfaces in IOS. The following is a link that shows you these limits.

http://www.cisco.com/warp/public/63/idb_limit.html

Hope this helps,

Don

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